P7520A TriMode™ Probe - Tektronixdownload.tek.com/manual/P7520A-Probe-Instruction-Manual.pdf ·...

x

P7520ATriMode™ ProbeZZZ

Instruction Manual

*P071304800*

071-3048-00

P7520ATriMode™ ProbeZZZ

Instruction Manual

xx

www.tektronix.com071-3048-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and areprotected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in allpreviously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

EZ-Probe is a registered trademark of Cascade Microtech, Inc.

TriMode is a trademark of Tektronix, Inc.

Contacting TektronixTektronix, Inc.14150 SW Karl Braun DriveP.O. Box 500Beaverton, OR 97077USA

For product information, sales, service, and technical support:In North America, call 1-800-833-9200.Worldwide, visit www.tektronix.com to find contacts in your area.

http://www.tektronix.com/contact

WarrantyTektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date ofshipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defectiveproduct without charge for parts and labor, or will provide a replacement in exchange for the defective product. Parts, modules andreplacement products used by Tektronix for warranty work may be new or reconditioned to like new performance. All replacedparts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty periodand make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping thedefective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of theproduct to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shallbe responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance andcare. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnelother than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use orconnection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; ord) to service a product that has been modified or integrated with other products when the effect of such modification or integrationincreases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES,EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY ORFITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTSIS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIXAND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGESIRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCHDAMAGES.

[W2 – 15AUG04]

Table of Contents

Table of ContentsGeneral safety summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iiiEnvironmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viKey Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Operating Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Connecting to the Host Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Connecting Accessories to the Probe Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Control Box Controls and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Connecting to Your Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Functional Check and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Functional Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9TriMode Probe Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Basic Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Maximizing P7520A Signal Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Connecting to a Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Connecting the Probe to Instruments without a TekConnect Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Accessories and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Standard Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Attenuation and Input Mode Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Input Voltage Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37TriMode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Probing Techniques to Maximize Signal Fidelity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Input Impedance and Probe Loading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Warranted Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Typical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Nominal Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Tip Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Host Instrument Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Replaceable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Handling the Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86Cleaning the Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87Returning the Probe for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Index

P7520A Probe Instruction Manual i

Table of Contents

ii P7520A Probe Instruction Manual

General safety summary

General safety summaryReview the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.

To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

To avoid fire or personal injuryConnect and disconnect properly. Connect the probe output to the measurement instrument before connecting theprobe to the circuit under test. Connect the probe reference lead to the circuit under test before connecting the probeinput. Disconnect the probe input and the probe reference lead from the circuit under test before disconnecting the probefrom the measurement instrument.

Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult theproduct manual for further ratings information before making connections to the product.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

Do not operate without covers. Do not operate this product with covers or panels removed.

Do not operate with suspected failures. If you suspect that there is damage to this product, have it inspected byqualified service personnel.

Avoid exposed circuitry. Do not touch exposed connections and components when power is present.

Do not operate in wet/damp conditions.

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry.

P7520A Probe Instruction Manual iii

General safety summary

Terms in this manualThese terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

Symbols and terms on the productThese terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the marking.

CAUTION indicates a hazard to property including the product.

The following symbol(s) may appear on the product:

iv P7520A Probe Instruction Manual

Environmental Considerations

Environmental ConsiderationsThis section provides information about the environmental impact of the product.

Product End-of-Life HandlingObserve the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and use of natural resources. Theequipment may contain substances that could be harmful to the environment or human health if improperly handled at theproduct’s end of life. In order to avoid release of such substances into the environment and to reduce the use of naturalresources, we encourage you to recycle this product in an appropriate system that will ensure that most of the materials arereused or recycled appropriately.

The symbol shown below indicates that this product complies with the European Union’s requirements according to Directive2002/96/EC on waste electrical and electronic equipment (WEEE). For information about recycling options, check theSupport/Service section of the Tektronix Web site (www.tektronix.com).

Restriction of hazardous substancesThis product is classified as an industrial monitoring and control instrument accessory, and is not required to comply with thesubstance restrictions of the recast RoHS Directive 2011/65/EU until July 22, 2017.

P7520A Probe Instruction Manual v

Preface

PrefaceThis manual describes the installation and operation of the P7520A TriMode Probe. Basic probe concepts, specifications,and maintenance procedures are included in this manual. You can also access the Tektronix Web site for this manual(www.tektronix.com/manuals).

DocumentationTo read about Use these documentsInstallation and operation Read this instruction manual for information about how to use your probe.Specifications Read the Specifications section in this manual.Reordering accessories Use the Accessories and Options section or refer to the insert in your

accessory kit when reordering accessories.

vi P7520A Probe Instruction Manual

Key Features

Key FeaturesThe P7520A TriMode Probe allows you to take differential, single-ended, and common mode measurements with one probeconnection. Key features include:

Revolutionary TriMode operation

TekConnect interface

Bandwidth (typical)>25 GHz in A – B mode with optionalP75PST solder tip @ 100 GS/s

>20 GHz in A – B mode with standardP75TLRST solder tip

Rise time (10-90%)<20 ps in A – B mode with optionalP75PST solder tip @ 100 GS/s

<27 ps in A – B mode with standardP75TLRST solder tip(<29 ps in other modes)

100 kΩ differential input resistance,50 kΩ per side

P7520A Probe Instruction Manual 1

Operating Considerations

Operating ConsiderationsTable 1: P7520A TriMode Probe CharacteristicsCharacteristic Description SpecificationInput voltage Dynamic range

Input voltage range(DC + peak AC, both ranges;input referenced to ground)

±0.625 V (5X)±1.60 V (12.5X)+3.7 V, –2.0 V

Temperature OperatingNonoperating

0 to +40 °C (+32 °F to +104 °F)-20 °C to +71 °C (-4 °F to +160 °F)

Humidity OperatingNonoperating

Up to +40 °C (+104 °F) 20%-80% RH+30 °C to +46 °C (+86 °F to +115 °F) 0-90% RH

Pollutiondegree

2, Indoor use only

CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist strap (provided with your probe), and work at astatic-approved workstation when you handle the probe.

2 P7520A Probe Instruction Manual

Installation

InstallationThe P7520A probe is capable of measuring signals in excess of 25 GHz bandwidth. However, maximum performance isonly available when the probe is used with a P75PST probe tip and an oscilloscope with the TekConnect interface and atleast 25 GHz bandwidth.

NOTE. Your TekConnect instrument may require a firmware upgrade to support full functionality of the P7520A probe.Before you connect the probe, check the version requirements. (See page 70, Host Instrument Firmware.)

When the probe is connected to compatible ≥25 GHz bandwidth oscilloscopes, probe characteristic data is transferred tothe oscilloscope and is stored for future use on all channels. The data transfer time typically takes a few minutes, and isonly done the first time the connection is made. Oscilloscopes with bandwidths lower than 25 GHz will not transfer thedata, and the system bandwidth will be limited.

Connecting to the Host Instrument1. Slide the probe into the TekConnect

receptacle. The probe clicks into placewhen fully engaged.

2. Turn the thumbscrew clockwise(finger-tight only) to secure the probe tothe instrument.

CAUTION. Do not tighten the thumbscrewbeyond finger-tight. Over-torquing can resultin performance degradation.

3. To disconnect, turn the thumbscrewcounter-clockwise.

4. Press the latch release button and pullthe probe away from the instrument.


Installation

Probe Power-OnAfter the initial connection to theoscilloscope is made:

1. The probe briefly lights all LEDs duringa self-test, and then one Range and oneMode LED remain lit.

2. If applicable, the probe transfers datato the host instrument, and a messagedisplays on the instrument as the transferoccurs.

3. The data transfer takes a few minutes,and is only done when the hostinstrument discovers a new probe. Thedata transfer only occurs on instrumentsthat are fully compatible with the probe.

4. The host instrument displays the ProbeTip Selection screen. The defaultselection is Other Tip (no DSP).

5. Select the tip you are using and click OK.The tip selection that you make here isretained until you change it. The ProbeTip Selection screen does not appearagain at power-on; you must access itthrough the Probe Setup screen. (SeeFigure 1 on page 6.)


Installation

Connecting Accessories to the Probe Body

CAUTION. The probe has replaceable contacts inside the probe body connector that may stick to the accessory connectorwhen it is disconnected. To prevent damage to the probe, before you connect accessories to the probe body, alwayscheck that the contacts are located in the probe body only.

The probe body and tip cable ends are keyedto ensure correct installation. Connect themas follows:

1. Orient the probe body with the A and Binputs on top, as shown.

2. Align the tip cable lead with the red bandto the A input.

3. Grasp the cable connector by hand andpush the cable into the probe body untilyou feel a click. The cable housing isfully seated when it is flush with the edgeof the probe body.

4. To remove the tip, pull the cable tabstraight out from the probe body.

CAUTION. Pull only on the cable tab whenremoving the tip. You may damage the tip orprobe if you pull on the cables.


Installation

Control Box Controls and IndicatorsAtten. Button and LEDsAfter the probe is connected, the hostinstrument automatically selects theattenuation (voltage range) of the probe,depending on the instrument volts/div setting.You must change the attenuation autoselectfeature on the instrument to enable theAtten. button on the probe:

1. In the oscilloscope menu bar, selectVertical and then select Probe Setup.

2. From the Probe Setup or Probe Controlsscreen, change the Range selectionfrom Auto to Manual. (See Figure 1on page 6.) You can also change theattenuation setting from these screens.

3. With the instrument in Manual Rangemode, press the Atten. button onthe probe to toggle the attenuationsetting between 5X and 12.5X. Thecorresponding LED lights to indicate theselected attenuation.

Figure 1: Probe Setup and Probe Controls screens


Installation

Input Mode Button and LEDsPress the Input Mode button to select one ofthe four TriMode measurements. The modescycle in the following sequence:

A – B (for differential signalmeasurement)

A – GND (for A input single-endedmeasurement)

B – GND (for B input single-endedmeasurement)

(A + B)/2 – GND (for common modemeasurement)

NOTE. Some oscilloscope models onlyallow the A – B Input Mode to be selected,depending on which input tip is selected inthe oscilloscope Probe Setup screen. (Seepage 71, Input Mode/Probe Tip Selection.)

The following pages discuss characteristicsof the TriMode measurements.

TriMode ProbingThe TriMode feature allows you to viewtwo single-ended signals and the resultantdifferential waveform and common-modevoltage without moving the probe connection.Press the Input Mode button to cycle throughthe waveform views.This example shows a typical HDMI signal(one half-lane) on the A and B inputs.The resultant differential waveform andcommon-mode voltage are shown.


Installation

Connecting to Your CircuitBefore you connect these tips to your probe, we recommend that you perform a functional test and probe calibration.(See page 9, Functional Check and Calibration.) Procedures for attaching the probe tips are described in Basic Operation.(See page 16, Basic Operation.)

Use the P75TLRST Long Reach Solder Tipto connect the probe to your circuit. TheP75TLRST Long Reach Solder Tip providesa soldered, multi-point connection (A, B, andGND). The P75TLRST tip is shipped withthe probe.Use the optional P75PST PerformanceSolder Tip to get full bandwidth (>25 GHz)measurements from the probe.These tips provide full TriMode capabilities,which are described in Basic Operation.(See page 36, Input Mode Selection.)Other tips are available and are describedlater. (See page 30, Optional Accessories.)

The optional P75PDPM Precision DifferentialProbing Module allows handheld andfixtured probing of your circuit. The small,precision-tapered tips and adjustable-widthtip spacing accommodate a variety of testingneeds.The P75PDPM Probing Module is designedfor differential measurements, and does notincorporate a ground connection to yourcircuit. However, you can make single-endedmeasurements in the TriMode A – B mode byconnecting the B input to your circuit ground.


Functional Check and Calibration

Functional Check and CalibrationAfter you connect the probe to the oscilloscope, perform a functional check using the calibration board included with the probe.


Functional CheckThis procedure checks the four TriMode settings on the probe, using the PROBE COMPENSATION or FAST EDGEconnection on the front panel of the oscilloscope. The A – B (differential mode) is set up and verified first, and then theremaining input modes are checked and compared to the differential mode measurement.

Table 2: Required EquipmentItem Description Performance Requirement Recommended Example 1

Oscilloscope TekConnect Interface Tektronix DPO/DSA72504DTest board TriMode DC Calibration board 067-1821-xx 2

Coaxial cable SMA, 50Ω, male-to-male 174-1120-xx 2

Coaxial cable BNC, 50Ω, male-to-male 012-0208-xx 2

1 Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers2 Standard accessory included with probe



Test Setup1. Connect the probe to any channel (1–4)

of the oscilloscope.

2. Set the oscilloscope to display thechannel.

3. Connect an SMA cable from the ProbeCompensation or FAST EDGE outputconnector on the oscilloscope to theSMA connector on the TriMode DCCalibration board.

4. Set the two output switches on theTriMode DC Calibration board to theFAST RISE position.

5. Connect the probe to the cable on theTriMode DC Calibration board (notecorrect connector polarity).

Test Procedure6. Set the probe attenuation to 12.5X and

the Input Mode to A – B.

7. Adjust the oscilloscope to display astable waveform (or press the Autosetbutton).

NOTE. If you do not see a waveform, checkthe connection at the probe body. (Seepage 5, Connecting Accessories to theProbe Body.)

8. When you see a stable square wave,check the amplitude. (Use the horizontalcursors.) Signal output levels for someoscilloscope models are listed below.

DPO/DSA72504D: 440 mV p-p

DPO/DSA73304D: 440 mV p-p



9. Cycle the Input Mode button through theremaining selections and compare thedisplayed waveforms to the waveformthat you measured in step 8.

A – B (the waveform from step 8)

A – GND (same amplitude andpolarity as measured in step 8)

B – GND (the B input is grounded; nosignal is measured)

(A+B)/2 – GND (half-amplitude, butthe same polarity as measured instep 8)

10. Set the probe attenuation to 5X and theInput Mode to A – B.

11. Repeat steps 7 through 9 for the 5Xattenuation setting.



TriMode Probe CalibrationAfter you perform a functional check of the probe, run a probe calibration routine. We recommend that you repeat the probecalibration for all four of the TriMode settings, and do this on each channel that you use.

The probe calibration operation minimizes measurement errors by optimizing the gain and offset of both probe attenuationsettings on each channel. Individual calibration constants are stored for each calibrated TriMode setting, on each probe, oneach channel.


You can use the equipment shown in the Functional Check to perform the probe calibration. (See Table 2 on page 9.)



Check the Instrument CalibrationStatusThe Calibration Status of the instrumentSignal Path Compensation test must bePass for the probe calibration routine to run.

1. From the Utilities menu, select InstrumentCalibration.

2. In the Calibration box, check that theStatus field is Pass.

3. If the status is not pass, disconnect allprobes and signal sources from theoscilloscope, and run the Signal PathCompensation routine.

When the Signal Path compensation teststatus is Pass, calibrate the probe. (Seepage 13, Calibrate the Probe.)

Calibrate the Probe1. Connect the probe to any channel (1–4)

of the oscilloscope. Allow the probe towarm up for 20 minutes.

2. Set the oscilloscope to display thechannel.

3. Connect a BNC cable from the ProbeCalibration output connector on theoscilloscope to the BNC connector onthe TriMode DC Calibration board.

NOTE. You may be able to use the PROBECOMPENSATION output connector. Checkyour oscilloscope manual or online Help formore information.

4. Connect the probe to the cable on theTriMode DC Calibration board.

5. Set the Input Mode to A – B on the probe.



6. Set the switches on the TriMode DCCalibration board to the positions shownfor the selected input mode. (SeeTable 3.)

Table 3: TriMode DC Calibration board switch settingsProbe input mode Fast rise/probe cal Gnd/SigA – B Probe Cal GndA Probe Cal SigB Probe Cal Sig(A+B)/2 Probe Cal Sig



7. In the menu bar, select Vertical and thenselect Probe Cal.

The Probe Setup screen appears. (Someoscilloscopes support an automated TriModecalibration routine and switch automaticallybetween input modes.)

8. Select Compensate Probe.The probe calibration routine runs, optimizingthe probe to the oscilloscope for both probeattenuation settings. The displayed resultsdiffer between oscilloscope models:

9. Oscilloscopes that do not support theautomated TriMode calibration routinedisplay Compensated in the ProbeStatus box. Repeat steps 5 through 8 forthe remaining input mode settings.

NOTE. If the Probe Cal routine fails, checkthe connection at the probe body. (Seepage 5, Connecting Accessories to theProbe Body.)

10. Oscilloscopes that support the automatedTriMode calibration routine will displayan on-screen prompt to toggle the probecalibration fixture SIG/GND switch.Follow the instructions to complete thecalibration for the remaining input modes.

11. After a successful Probe Cal,Compensated appears in the ProbeStatus box.

NOTE. If the Probe Cal routine fails, checkthe connection at the probe body. (Seepage 5, Connecting Accessories to theProbe Body.)


Basic Operation

Basic OperationThis section includes more information about using the probe controls on the control box and procedures for connectingthe probe to your circuit.

Maximizing P7520A Signal BandwidthThe bandwidth of the P7520A probe canbe maximized to 25 GHz only when thefollowing conditions are met:

The host oscilloscope bandwidth must be≥25 GHz and not be bandwidth limited.

The host oscilloscope sample rate mustbe set to 100 GS/s. Slower sample ratesreduce the probe bandwidth.

The P7520A Input Mode must be set to(A – B) mode. (Note: the bandwidth isless for other input modes.)

A P75PST solder tip must be used forthe probe DUT connection.

The solder ramp that is supplied with theprobe is recommended as an aid to keepthe probe tip wire connections as shortas possible (<0.032 in./0.8 mm).


Basic Operation

Connecting to a Circuit BoardThe P75TLRST Long Reach Solder Tip is shipped with the probe. Use the P75TLRST tip to connect the probe to your circuit,or use the optional P75PST TriMode Performance Solder Tip for ≥25 GHz bandwidth measurements. Other TriMode soldertips are available, as well as a handheld probing module, described on the following pages.

P75TLRST TriMode Long ReachSolder Tip (Standard)

P75PST TriMode PerformanceSolder Tip (Optional)The Long Reach and PerformanceSolder tips enable you to make full signalcharacterizations from a multi-point solderedconnection.The soldered connection passes the twocomplementary signals (the A signal and theB signal), and a ground reference from yourcircuit to the TriMode probe.The P75PST tip is optimized for high-speedperformance. Maximum P7520A bandwidthcan only be achieved with the P75PSTtip and an oscilloscope with ≥25 GHzbandwidth.

TriMode Resistor Solder TipsThese are optional accessory tips that youcan order for your probe. The tips providesolder connection points for the A and Bprobe input signals at the resistor leads,instead of on the solder tip board.

1. 020-2936-xx TriMode Resistor SolderTip – measures <29 ps rise times

2. 020-2944-xx TriMode Extended ResistorSolder Tip – measures <32 ps rise times

The tip resistors can tolerate more soldercycles than the P75TLRST tip board, andcan be replaced when necessary.These tips provide full TriMode capabilitieswhen you use the soldered-groundconnection on the tip board.

CAUTION. The TriMode solder tips arevery small and must be handled carefully toavoid damaging them. The following pagesdescribe the proper techniques for using thetips.


Basic Operation

The dimensions of the solder tip connectionsare provided here for reference. You canalso design the tip footprint into your circuitboard layout for easier test connections.To connect the probe tip to your circuit, usethe wire and solder that are provided in thewire replacement kit. The kit includes:

0.004 in (0.10 mm) wire

0.008 in (0.20 mm) wire

SAC305 solder (RoHS compliant)You will also need tweezers, a low-wattagesoldering iron, and a pair of sharp wirecutters.Separate procedures follow for soldering thedifferent tips to your circuit.


Basic Operation

Connect the P75TLRST or P75PSTSolder TipYou must keep the interconnect wire lengthsshort (<0.032 in./0.8 mm) to achieve 25 GHzperformance with the P75PST Solder Tip.Use the solder tip ramp to position thetip board close to the DUT test points tominimize wire lengths.

1. Identify a location where the tip can beplaced, soldered, and secured to yourcircuit.

NOTE. You can work with long wires(~1 inch), but keep the finished wire lengthsof the signal and ground connections asshort as possible.

2. Lay the wires against a circuit board pad,trace, or other conductive feature. (Ifvias or through-holes are very close, youcan thread the wires through them.)

3. Solder the wires to your circuit.

NOTE. For best results, use a flux pen toclean your connections before soldering.


Basic Operation

4. Align the bottom of the tip to the notch inthe ramp as shown, and then secure thetip to the ramp with glue or tape.The notch in the ramp helps you toposition the tip as close as possible(<0.032 in./0.8 mm) to the circuitconnections. Very short leads arerequired for 25 GHz measurements.

5. Thread the wires through the tip.

6. Press the tip to the circuit board andsolder the wires to the tip. Keep allfinished wire lengths as short as possible.

7. Clip off the excess wire from all of thesolder joints.

8. Attach the probe to the tip. (Notepolarity).

9. For a secure mechanical connection,use tape or hot glue to secure the tipand probe to your circuit. (See page 22,Secure the Tip.)

Soldered Tip ExampleThe lead length of the connection wiresbetween the probe tip board and the DUTmust be kept as short as possible to preservethe integrity of the measured signal.The connection wires must also be kept asequal in length as possible to minimize theskew between the A and B inputs.This photo shows the P75PST solder tipmounted to the circuit with the solder ramp.Typical wire lengths required for 25 GHzperformance are <0.032 in./0.8 mm.Use a magnifying glass or microscope to getthe best results. (See page 23, Notes onUsing the Tips.)


Basic Operation

Connect the TriMode ResistorSolder TipsUse this procedure to connect both styles ofresistor tips to your circuit.

1. Choose a location where the solder tipresistor leads can reach your test points.If you are using a ground connection,note which solder tip ground via isclosest to your circuit ground.

2. Apply solder to the test points on yourcircuit.

3. If you are not using the ground, solderthe resistor leads to your circuit, clip offany excess, and go to step 11.

4. If you are using a ground wire, applysolder to the solder tip ground via thatyou chose.

5. Position a length of wire about 1-inchlong under the solder tip via.

6. Heat the solder tip via and insert the wire.

7. Cut the excess wire on the other side ofthe solder tip, flush with the board.

8. Cut the ground wire to the length requiredto reach your circuit ground. Keep theground wire as short as possible toensure good performance.

9. Solder the ground wire to the circuit andclip off any excess wire.

10. Solder the resistor leads to the testpoints on your circuit and clip off anyexcess leads.


Basic Operation

Secure the Tip11. Push the end of the tip into the probe

head until it seats in the probe head.

12. For a secure mechanical connection,use tape or hot glue to secure the tip toyour circuit.

13. Secure the probe to the circuit board withtape or hook-and-loop strips.


Basic Operation

Notes on Using the Tips.Use the following precautions when you solder the tips:

Use a low-wattage, temperature-controlled soldering iron and a small mass soldering iron tip. The soldering irontemperature should be set as low as possible, while still providing a reliable solder joint.

Use SAC305 solder (included with the wire replacement kit) to attach the tip wires to the circuit under test.

The attachment wires should be bent symmetrically to vary the interconnect spacing. Use care when you solder a tip to acircuit under test to avoid inadvertently desoldering either the attachment wires or the damping resistor.

For optimum performance and signal integrity, keep the lead length between the DUT (Device Under Test) and the tip asshort as possible, and the lead lengths the same length.

CAUTION. To prevent damage to the circuit board or circuit board connections due to accidental movement of the probeand soldered leads, we recommend that you secure the tip to the circuit board using the adhesive tip tape provided in youraccessory kit. You can also use other materials such as Kapton tape or hot glue.

To avoid damage to the tip or the circuit under test, avoid applying excessive heat from the soldering iron. Use a low wattage,temperature-controlled soldering iron and appropriately sized soldering iron tip.


Basic Operation

P75PDPM Precision Differential Probing Module (Handheld)

This is an optional accessory. (See page 30,Optional Accessories.)

Assemble the Module1. Position the module housing as shown.

2. Slide the probing module handle adapterinto the module housing.

3. Secure the handle adapter with thethumbscrew.

4. Insert the probe in the handle adapter.

5. Attach the cable to the probe body.Match the red band to the A input.

6. You can dress the cable in the channelsas shown. The front channels are captiveand the rear channels are guides.


Basic Operation

Adjustments1. Adjust the tip angle by loosening the

setscrew and pivoting the tip. Tightenthe setscrew to secure the tip.

2. Adjust the tip spacing by turning theadjustment wheel.The probing module is shipped with aground spring installed between the tips.The spring is necessary to pass thehighest-fidelity signal to your instrument.The two available spring sizes are shownin steps 3 and 4.

3. The large spring is pre-installed on theprobe and allows a tip-to-tip span from0.050 to 0.180 inches (1.27 to 4.57 mm).

4. The small spring allows a tip-to-tip spanfrom 0.030 to 0.090 inches (0.76 to2.28 mm).

NOTE. Spring replacement requires aspecial tool. (See page 30, OptionalAccessories.)

Mounting FeaturesYou can mount the probing module to avariety of fixtures and custom probing arms,using the features described below:

1. The barrel at the rear of the P75PDPMfits into the end of the PPM203B probeholder.

2. The threads inside the barrel are metric(M6 x 1), and attach to the EZ-ProbePositioner from Cascade MicroTech.

3. The slot below the barrel slides onto thetab of the PPM100 Probe Positioner.Secure the module to the tab with thethumbscrew.

4. Use these threaded holes (6–32,8–32, and 10–32) for custom-mountapplications.


Basic Operation

Connecting the Probe to Instruments without a TekConnect InterfaceThe 80A03 TekConnect Probe Interfaceadapts any TekConnect probe to theTDS8X00, CSA8X00, and DSA8200 Seriesoscilloscopes.The RTPA2A TekConnect Probe Interfaceadapts any TekConnect probe to TektronixReal-Time Spectrum Analyzers.

NOTE. The 80A03 and RTPA2A interfacesare limited to a pass-through bandwidth of18 GHz.

For proper probe operation, the ProbeInterface firmware must be compatible withthe probe. (See page 70, Host InstrumentFirmware.) The firmware version label is onthe rear panel of the 80A03 instrument.

The host instrument may also require afirmware and/or operating system upgrade.See your instrument manual for moreinformation.


Accessories and Options

Accessories and OptionsYou can reorder the following replacement parts and accessories. Note that in some cases, the reorder quantities may differfrom those that ship with the probe.

Standard AccessoriesThe following accessories are shipped with the P7520A probe. If no quantity is listed, only one of that item is shipped.

AccessoryReorder part numberand quantity Description016-1997-xx Nylon carrying case with inserts. This carrying case has

several compartments to hold the probe and accessories.

006-3415-xx Antistatic wrist strap. When you use the probe, alwayswork at an antistatic work station and wear the antistaticwrist strap.

- - Calibration certificate. A certificate of traceable calibrationis provided with every probe.

--- Data calibration report. The Data Calibration Report liststhe manufacturing test results of your probe at the time ofshipment and is included with every probe.

071-3048-xx Instruction manual. The instruction manual providesinstructions for operating and maintaining the P7520ATriMode probe.

067-1821-xx TriMode DC calibration fixture. Use this fixture to performa functional check and a DC calibration with the hostinstrument.



AccessoryReorder part numberand quantity Description174-1120-xx 50 Ω SMA-M to SMA-M cable assembly, 8.5 in.

To perform a functional check, use this cable to connectthe DC Calibration fixture to the Fast Rise Time outputconnector on the host instrument.

012-0208-xx 50 Ω BNC-M to BNC-M cable assembly, 10 in.To perform a probe calibration, use this cable to connectthe DC Calibration fixture to the DC Probe Cal outputconnector on the host instrument.

020-3118-xx (packageof 25)

Solder tip ramp kit.These ramps help you to position the solder tips on yourcircuit. Glue or tape a ramp to the bottom of the soldertip so that the tip connections are as close as possible toyour circuit connections (<0.032 in./0.8 mm for 25 GHzmeasurements). The ramps work with all of the TriModesolder tips.

020-2729-xx Accessory kit. The kit includes an assortment ofaccessories that are described below. A reference sheetis included as a quick guide for using and reordering theprobe accessories in the kit.The foam insert includes slots for the optional P75PDPMaccessories that you can order.

P75TLRST TriMode Long-Reach Solder Tip.This tip provides a soldered, multi-point connection thatsupports full TriMode measurement capabilities at full probebandwidth.Two tips are included with the probe.

006-8237-xx(Strip of 10)

Adhesive tip tape. Use the double-sided adhesive tip tapeto secure the solder tip assembly to your circuit board.



AccessoryReorder part numberand quantity Description016-0633-xx(Package of fivecolored pairs)

Color band kit. This kit includes two sets of five coloredpairs. When you are using more than one probe, the bandsenable you to visually match the probes to the channelsthat they are connected to.To use the marker bands, attach one band to the indenton the molded strain relief on the probe cable. Use thematching color band on the other end of the probe, at thecontrol box.

Maintenance accessories listed below020-2754-xx(Package of 3 bobbins)

Wire replacement kit. This kit includes three bobbins:SAC305 lead-free solder (RoHS compliant), 4 mil wire, and8 mil wire. Use this kit to add wire leads on the solder tips.

013-0359-xx(Package of 4)

Replacement bullet contacts. To maintain the bestsignal integrity, replace the bullets in the probe body after200 insertion cycles.

003-1896-xx Bullet removal tool. This tool allows you to safely removeand install the bullet contacts in the probe head.



Optional AccessoriesOptional accessory Part number Description

P75PST TriMode Performance Solder Tip.This tip provides a soldered, multi-point connection thatsupports full TriMode measurement capabilities at full probebandwidth.

020-2936-xx TriMode Resistor Solder Tip kit.This tip provides solder connection points at 100 Ω resistorsthat extend about 0.2 in (5 mm) from the solder tip board.The resistors can withstand more solder cycles than theP75TLRST and P75PST solder tips, and can be replacedif they break.This tip can measure rise times down to <29 ps.A kit of replacement resistors is available; see below.

020-2944-xx TriMode Extended Resistor Solder Tip kit.This tip provides solder connection points at 100 Ω resistorsthat extend about 0.6 in (15 mm) from the solder tip board.The resistors can withstand more solder cycles than theP75TLRST and P75PST solder tips, and can be replacedif they break.This tip can measure rise times down to <32 ps.A kit of replacement resistors is available; see below.



Optional accessory Part number Description020-2937-xx Replacement resistor kit for TriMode solder tips.

This kit includes:

100 Ω leaded resistors, quantity 50

75 Ω surface-mount, 0402 resistors, quantity 50

Nonconductive tubing, quantity 50

P75PDPM Probing module kit.This kit allows you to browse multiple test points in yourcircuit without using a soldered connection.The kit includes the parts listed under P75PDPM kitcontents below; some are also orderable separately.

P75PDPM kit contents Part number DescriptionOrder P75PDPM kit Probing module.

The Probing Module includes the P7500 Tip Cable and alarge ground spring pre-attached to the tip pair, ready toconnect to your probe. To order the Probing Module, orderthe P75PDPM kit.

P75TC P7500 tip cable. This cable connects the probe to theProbing Module Tip. When the Probing Module kit isordered, the cable is shipped pre-installed on the ProbingModule.To order the cable separately, order P75TC.

P75PMT Probing module replacement tips (pair).When the Probing Module kit is ordered, two sets of ProbingModule tip boards are shipped; one set is pre-installed onthe Probing Module. The replacement tips (one each leftand right) are built in pairs and must be separated beforeinstallation.To order the replacement tips separately, order P75PMT.

367-0545-xx Probing module handle adapter.The Handle Adapter connects the probe body to thehandheld probing module.



P75PDPM kit contents Part number Description016-1998-xx(Package of 4)

Ground spring kit, large.The handheld probing module requires a spring to make aground connection between the ends of the two input tips.Use the large ground spring for general-purpose browsing,when the required span between tips is from 0.050 in. to0.180 in. (1.27 to 4.57 mm).

016-1999-xx(Package of 4)

Ground spring kit, small.Use the small ground spring when you are probing densecircuits and where you may have multiple probes in aconfined area. The distance between the tips with thesmall spring installed is from 0.030 in. to 0.090 in. (0.76to 2.28 mm).

003-1900-xx Ground spring tool.This tool simplifies spring removal and installation. Theends of the tool match the two springs that mount betweenthe probe tips. A tab in the center of the tool is used toset the span of the tips to the optimum width for springreplacement.

003-1897-xx Connector separator tool.Use this tool to disconnect the P7500 Tip Cable from theProbing Module Tips. The tool protects the connectors andtips from damage by gently spreading them apart.



Optional accessory Part number Description067-1586-xx Deskew fixture. Use this fixture to time-align the probe to

other probes connected to your measurement system.

PPM203B PPM203B Articulating Arm. This high-precisionarticulating arm has fine adjustment controls for all threeaxes. It is designed for probing circuit boards, hybrids,and multi-chip modules (MCMs), that employ fine-pitchdevices and interconnects. Use the Articulating Arm toprovide stability and support for the probes when takingmeasurements. Use the Probe Arm Adapter to attach aprobe to the PPM203B Articulating Arm.

PPM100 PPM100 Probe Positioner. This general-purpose benchtopprobe holder with flexible arm is designed for hands-freeprobing that requires adjustable fine positioning. The heavyduty base can be replaced with the clamp for securing theprobe arm in a variety of situations.



Optional accessory Part number Description80A03 80A03 TekConnect Probe Interface Module. Use this

module with 80E0X Sampling Modules to adapt TekConnectprobes to TDS/CSA8000 and TDS/CSA8200 SeriesSampling Oscilloscopes.

NOTE. The 80A03 interface is limited to 18 GHzpass-through bandwidth.

The interface is composed of an enclosure that houses acompartment for one 80E0X Electrical Sampling Moduleand two TekConnect probe inputs. The interface routes theprobe signal outputs through SMA connectors on the frontpanel. Semi-rigid SMA cables link the probe outputs to the80E0X module inputs.

NOTE. The 80A03 adapter firmware must be version 2.3or above to ensure full functionality with the P7520A probe.

RTPA2A RTPA2A TekConnect Probe Adapter. This adapterallows you to connect a TekConnect probe to a Real-TimeSpectrum Analyzer.

NOTE. The RTPA2A interface is limited to 18 GHzpass-through bandwidth.

The RTPA2A adapter firmware must be version 2.3 orabove to ensure full functionality with P7500 Series Probes.

OptionsOption CA1. A single calibration event, or coverage for the designated calibration interval, whichever comes first.

Option C3. Calibration Service 3 years

Option C5. Calibration Service 5 years

Option D1. Calibration Data Report-ships standard with probe

Option D3. Calibration Data Report, 3 years (with Option C3)

Option D5. Calibration Data Report, 5 years (with Option C5)

Option G3. Gold Plan 3 years

Option G5. Gold Plan 5 years

Option R3. Repair Service 3 years

Option R5. Repair Service 5 years

-R3DW. Repair service coverage: 3 years (includes product warranty period), 3 year period starts at time of purchase.

-R5DW. Repair service coverage: 5 years (includes product warranty period), 5 year period starts at time of purchase.


Theory of Operation

Theory of OperationThis section discusses operating considerations and probing techniques.

The P7520A probe is optimized for high bandwidth; it is not a general-purpose probe. The probe tips are miniaturized forelectrical characteristics and access to dense circuitry, and must be handled carefully.

CAUTION. To prevent damage to the probe, use care when handling the probe. Rough or careless use can damage theprobe.

Attenuation and Input Mode SettingsAttenuation SelectionThe Atten. (attenuation) button toggles the probe between the two nominal attenuation settings of 5X and 12.5X. Thechoice of attenuation setting is a tradeoff between probe dynamic range and noise. The probe dynamic range representsthe operating range over which the probe is linear to within some specified percentage, such as ±1%. The probe noise isusually specified as a noise spectral density and is significant because of the wide probe bandwidth. The 5X attenuationsetting provides the lowest noise performance. The 12.5X attenuation setting provides the largest dynamic range. Theactual probe attenuation factor is automatically accounted for by the attached oscilloscope using the intelligent TekConnectprobe interface. The attached oscilloscope also indicates the probe dynamic range with momentarily-displayed arrows whenthe vertical channel controls are changed at larger vertical scale factor settings.


Theory of Operation

The usual choice for attenuation setting should be 5X, if the measured signal fits within the specified dynamic range, sincethat provides the best noise performance. The probe Offset control can also be used with some signals to compensate for aDC bias and bring the displayed signal within the specified dynamic range. Although it is possible to measure signals thatexceed the dynamic range of the probe, the measured signal performance becomes increasingly non-linear and eventuallyreaches a limiting level. Although probe signal limiting does not damage the probe (as long as the maximum input voltage isnot exceeded), the measured response no longer accurately represents the input signal.

Input Mode SelectionThe Input Mode button toggles the internal probe input selector switches between the four input mode selections. ThisTriMode feature allows full characterization of a differential signal from a single soldered connection.

A-B Mode. The A-B Mode is used for making differential signal measurements and represents the traditional differentialprobe functionality. Since the A-B Mode measures the difference between the A and B input signals, it eliminates anycommon mode voltage, such as a DC bias common to both inputs, within the CMRR performance capability of the probe.For P7500 probe tips, such as the P75PDPM, which do not provide a TriMode ground reference, the A-B Mode is the onlyuseful mode for making low noise measurements. In fact, some oscilloscope models only allow the A-B Mode to be selectedwhen the connected tip does not include a ground reference. The A-B Mode can also be used for making single-endedmeasurements with the P75PDPM probe tip by connecting the B input to the local circuit ground.

A-GND Mode. The A-GND mode is used for making probe A input single-ended measurements with TriMode probe tipssuch as the P75TLRST and P75PST. These probe tips include a solder connection for the local circuit ground. In the A-GNDMode the P7500 probe input switch is configured to measure the A input relative to this local circuit ground reference. The Ainput signal measurement in A-GND Mode is designed for minimal coupling from any signal present on the B input within theA input isolation performance of the probe.

The A-GND Mode is not recommended for measurement use with the P75PDPM probe tip because of the lack of a localcircuit ground connection (and some oscilloscope models do not allow the A-GND Mode to be selected with the P75PDPM).

B-GND Mode. The B-GND mode is used for making probe B input single-ended measurements with TriMode probe tipssuch as the P75TLRST and P75PST. These probe tips include a solder connection for the local circuit ground. In the B-GNDMode the P7500 probe input switch is configured to measure the B input relative to this local circuit ground reference. The Binput signal measurement in B-GND Mode is designed for minimal coupling from any signal present on the A input within theB input isolation performance of the probe.

Like the A-GND Mode, the B-GND Mode is also not recommended for measurement use with the P75PDPM probe tipbecause of the lack of a local circuit ground connection.

(A+B)/2 Mode. The (A+B)/2 Mode is used for making common mode measurements on a differential signal andrepresents a new probe feature that previously could only be made using oscilloscope math on multiple channels. For adifferential signal, the common mode measurement indicates the DC bias level and also shows the degree of asymmetrybetween the A and B inputs. Since the (A+B)/2 Mode measures the average between the A and B input signals, it eliminatesany complementary differential signal voltage, within the DMRR performance capability of the probe.


Theory of Operation

Input Voltage LimitsThe P7520A probe is designed to probe low-voltage circuits. Before probing a circuit, take into account the limits formaximum input voltage, the operating voltage window, and the differential-mode signal range. (See Table 5 on page 52.)

Maximum Input VoltageThe maximum input voltage is the maximum voltage to ground that the inputs can withstand without damaging the probeinput circuitry.

CAUTION. To avoid damaging the inputs of the probes, do not apply more than ±15 V (DC + peak AC) between each inputor between either probe input and ground.



Theory of Operation

Operating Voltage WindowThe operating voltage window defines the maximum voltage that you can apply to each input, with respect to earth ground,without saturating the probe input circuitry. (See Figure 2.) A common-mode voltage that exceeds the operating voltagewindow may produce an erroneous output waveform even when the differential-mode specification is met.

Figure 2: Operating voltage window

Differential-Mode Signal RangeThe differential-mode signal range is the maximum voltage difference between the A and B inputs that the probe can acceptwithout distorting the signal. The distortion from a voltage that exceeds this maximum can result in a clipped or otherwiseinaccurate measurement. The P7520A probe has two attenuation settings, 5X and 12.5X, that allow dynamic range to betraded off against signal noise. The 12.5X attenuator setting has the largest dynamic range; the 5X attenuator setting hasthe lowest noise. The graphs on the following pages illustrate the linearity error over the dynamic voltage range of theprobes in both attenuation settings.

Offset Voltage RangeThe Offset Voltage Control, accessible from the attached oscilloscope user interface, allows the probe dynamic range tobe effectively moved up and down within the limits of the offset voltage range and the operating voltage window. Whenthe offset voltage is set to zero volts and the input signal is zero volts (inputs shorted to ground, not open), the displayedsignal should be zero volts. If a noticeable zero volt offset is present under the above conditions, a Probe Cal operationshould be performed.


Theory of Operation

Figure 3: Dynamic range versus linearity, 5X range

Figure 4: Dynamic range versus linearity, 12.5X range


Theory of Operation

TriMode OperationThe TriMode feature of the P7500 Series probe family is designed for improved convenience and enhanced capability inmeasuring differential signal quality. Since a differential signal is composed of two complementary single-ended signals,full characterization of differential signal quality requires more than a simple differential measurement. A TriMode probefeatures three Input Modes that allow a differential signal to be fully characterized with four measurements: differential,positive polarity and negative polarity single-ended, and common mode.

A TriMode probe provides improved efficiency and convenience by enabling full differential signal characterization from asingle soldered connection. Using one of the solder tips available for the TriMode probes, (for example, the P75TLRSTprobe tip), probe connections are soldered to the two complementary signals (the A signal and the B signal) and a groundreference. From this single DUT (device under test) connection, the internal electronic switching control of the TriModeprobe allows any one of the three probe Input Modes (four measurements) to be selected at a time. The TriMode probeinputs are routed on the probe ASIC (application-specific integated circuit) to a set of four independent input amplifiersthat perform the following signal calculations:

A – B (for differential signal measurement)

A – GND (for positive polarity single-ended measurement)

B – GND (for negative polarity single-ended measurement)

[A+B]/2 - GND (for common mode measurement)

NOTE. In the B – GND Mode, the negative polarity B input is not inverted.

The four input amplifiers are multiplexed together and only the selected Input Mode function is output to the connectedoscilloscope. (See Figure 5 on page 41.) The figure shows a conceptual view of the TriMode probe input structure, wherethe C input provides the probe ground reference and is connected to the probe tip ground interconnect using the probetip cable coaxial shields.


Theory of Operation

Figure 5: TriMode input structure

On oscilloscopes that do not provide full TriMode support, the TriMode features are controlled by the probe Control Boxswitches, which allow oscilloscope features like Probe Cal to be exercised only for the selected probe Input Mode.

On oscilloscopes that provide full TriMode support, the oscilloscope-controlled probe GUI (graphical-user interface) canperform a Probe Cal operation on all Input Modes and Attenuation Settings at once using the TriMode Probe Cal fixturethat is supplied with P7500 Series probes. Full TriMode support will also allow storage and automatic recall of relevantsettings like Offset. (See Figure 6.)

Figure 6: Typical TriMode Probe Setup screen


Theory of Operation

Probing Techniques to Maximize Signal FidelitySignal fidelity is an indication of how accurately a probe represents the signal being measured. The signal fidelity of theprobe is best when the probe is applied properly to the circuit with the P7520A probe tips. Recommendations for connectingthe probe tips are given in the following section.

Probe Tip Cables and Connectors. Attached to the probe tip circuit board is a pair of very low skew (<1 ps) coaxialcables and a polarized G3PO dual connector block. The 3GPO connectors use a miniature, high frequency design thatenables quick and easy installation of the P75TLRST solder tip. The G3PO connector block of the probe tip is inserted intothe input nose piece on the end of the probe body of the P7500 family probes. The probe body contains a mating, polarizedG3PO connector block with attached G3PO connector bullets.

The connector bullets are a part of the G3PO connector design, providing a self-aligning interconnect mechanism betweenG3PO connectors. The G3PO connector in the probe body is designed to have higher detent force than the probe tipconnectors, which is intended to ensure that the G3PO bullets remain in the probe body connector when disconnected. Theprobe body nose piece, with its integral spring mechanism, helps to provide a self-aligning mechanism for hand insertion ofthe probe tip. The probe body nose springs also give a secure capture of the probe tip connector after insertion. Release ofthe probe tip is assisted by using the wire-connected cable release holder on the probe tip connector. This probe tip releaseholder should always be used rather than pulling on the probe tip cables, which may cause tip cable damage.

The following four figures illustrate the signal integrity effect on the P75TLRST solder tip when used with different lengths oftip wire. Signal fidelity is best when the wire length is kept as short as possible. The step generator that was used as asignal source for these screenshots has a 30 ps 10-90% rise time. The table in each figure contains data for two rise timemeasurements (10-90% and 20-80%). These screenshots can be used as a rough guide to gauge the effects of wire length,but actual results may vary depending on the other factors like characteristics of the device under test (for example, rise timeand impedance), precision of the solder connection, and the model of oscilloscope.

Figure 7: P75TLRST solder tip with 0.010 in. of tip wire


Theory of Operation




Theory of Operation

Solder Tip RampFor best performance, the solder tip mustbe placed very close to the circuit (within0.032 in./0.8 mm). The solder tip ramp isdesigned to hold the solder tips 0.025 in.(0.6 mm) away from your circuit connections.

Align the body of the tip to the notch in theramp as shown. This alignment to the notchensures the tip-to-circuit gap is 0.025 in.(0.6 mm). Glue or tape the tip to the ramp.

Thread the soldered wires from your circuittest point through the vias on the tip. Glue ortape the tip to your circuit, and then solderthe wires from your circuit to the tip.


Theory of Operation

P75PDPM Precision Differential Probing ModuleThe P75PDPM Probing Module is designed for handheld and fixtured probing applications. The P75PDPM probe tip iscomposed of two replaceable probe tip circuit boards with a pin on one end and a G3PO socket connector on the other.Damping resistors on the tip boards near the input pins and a 50 Ω transmission line on the board transmit the signal fromthe input pin to the G3PO socket connector. The probe tip boards are connected to the P7500 probe body with a verylow skew (<1 ps) cable assembly (P75TC).

The left-side and right-side probe tip boards mount at an angle in the P75PDPM adjustment housing. The probe tip spacingis adjustable from 0.030 – 0.180 in. (0.76 – 4.57 mm) using the thumb-operated screw. Because of the variable spacingbetween the two probe tip boards, a gold-plated ground spring is connected between the probe tip boards to ensure agood common mode ground return near the probe tip pins.

Figure 11: P75PDPM Precision Differential Probing Module

The P75PDPM probe tip circuit boards mount in an articulating metal housing that also supports the variable spacing control.The angle of the probe tip housing can be adjusted and locked in place using an articulation screw in the probe holder bar.The probe holder bar contains mechanical details for retaining the probe tip cable assembly as well as a retaining clampfor the probe body. The probe holder bar can be held manually or can be mounted for fixtured probing on an articulatingprobe arm using mechanical features in the holder bar.

The P75PDPM design features improved mechanical compliance in probe tip attachment to the DUT. Mechanical complianceis a significant issue for differential probes because of the difficulty in making reliable contact with two DUT connections atthe same time. The reliability in making this dual point connection can be improved by a tip structure with good mechanicalcompliance, in which there is sufficient give in the probe tips to absorb interconnect surface irregularity.

The P75PDPM does not have a local DUT ground connection because of the great difficulty in making a good three-pointinterconnect without soldering. As a result, the only low-noise TriMode Input Mode available with the P75PDPM is the A-B(DIFF) mode, since for differential signals, there is an inherent virtual ground present in the measurement circuit.

The following four figures illustrate the signal integrity effect of changing the spacing on the P75PDPM Probing Module.Signal fidelity is best with the tips at the smallest spacing. The step generator that was used as a signal source for thesescreen shots has a 30ps 10-90% rise time. The table in each figure contains data for two rise time measurements (10-90%and 20-80%). These screen shots can be used as a rough guide to gauge the effects of probe tip spacing, but actualresults may vary depending on the other factors like characteristics of the device under test (for example, rise time andimpedance) and the model of oscilloscope.


Theory of Operation

Figure 12: P75PDPM with short ground spring, 0.030 in. spacing



Theory of Operation




Theory of Operation

Input Impedance and Probe LoadingWhen you connect the probe inputs to a circuit, you are introducing a new resistance, capacitance, and inductance into thecircuit. Each input of the differential probe has a DC input impedance of 50 kΩ to ground. (See Figure 16.)

Figure 16: TriMode probe input model

For signals with low source impedance and frequency, the 50 kΩ input impedance on each input is large enough to preventthe inputs from loading the signal sources. The more the signal source impedance on an input increases, the more theprobe loads the source and reduces the signal amplitude. The greater the source impedances and the higher the signalfrequencies, the more you must take these factors into account.

The frequency of the signal also affects signal measurement. As the frequency of the signal increases, the input impedance ofthe probe decreases. The lower the impedance of the probe relative to that of the source, the more the probe loads the circuitunder test and reduces the signal amplitude. A high frequency input impedance model is shown below. (See Figure 17.)

Figure 17: TriMode probe high frequency input impedance model

For plots and representative R-L-C values of the individual TriMode solder tips, refer to the specifications. (See page 56,Tip Specifications.)


Theory of Operation

Embedded ProbeIt is possible to acquire signals with the P7500 Series TriMode probes by including an embedded connection in yourcircuit. (See Figure 18.) Connectors that mate to the P75TC Tip Cable can be incorporated in the circuit board design andcarefully placed to balance any reflections or other characteristics that may affect the circuit or measurement. An embeddedprobe connection will generally provide optimum probe performance because the signal interconnect lead length canbe minimized if implemented correctly. For more information about embedded probe connections, contact Tektronix.(See page , Contacting Tektronix.)

Figure 18: Embedded probe fixture


Specifications

SpecificationsThese specifications apply to the P7520A TriMode Probe when it is installed on an oscilloscope that has the supportingfirmware, DSP capabilities, and a TekConnect interface. The probe must have a warm-up period of at least 20 minutes andbe in an environment that does not exceed the allowed limits. (See Table 1.)

Specifications for the P7520A TriMode Probe fall into three categories: warranted, typical, and nominal characteristics.

Warranted CharacteristicsWarranted characteristics describe guaranteed performance within tolerance limits or certain type-tested requirements.

Table 4: Warranted electrical characteristicsCharacteristic SpecificationDC attenuation accuracy 0.200 ±2% (5X)

0.0800 ±2% (12.5X)Output Offset Zero ±3 mV (+20 to +30 °C, +68 to +86 °F) (5X) ±15 mV

on oscilloscope±3 mV (+20 to +30 °C, +68 to +86 °F) (12.5X)±37.5 mV on oscilloscope

Temperature Operating: 0 to +40 °C (+32 to +104 °F),Nonoperating: –20 to +71 °C (-4 to +160 °F)

Humidity Operating: 20–80% RH, at up to +40 °C (+104 °F)Nonoperating: 5–90% RH

Altitude Operating: 3000 meters (10,000 feet)Nonoperating: 12,000 meters (40,000 feet)


Specifications

Typical CharacteristicsTypical characteristics describe typical, but not guaranteed performance with an embedded probe only. Refer to TipSpecifications for specifications when using TriMode accessory tips. Highest performance is achieved when using theP75PST tip with the probe. (See page 56, Tip Specifications.)

Table 5: Typical electrical characteristicsCharacteristic SpecificationBandwidth (DSP corrected) 1 ≥25 GHz, differential mode, 100 GS/s

≥23 GHz, differential mode, 50 GS/s≥18 GHz, A, B, and common modes

Rise time 10–90% <20 ps, differential mode, 100 GS/s<23.5 ps, differential mode, 50 GS/s<29 ps, A, B, and common modes

20–80% <18 ps, A–B mode<20 ps, other modes

Operating voltage window -2.0 V to +3.7 V5X ±0.625 VDifferential signal range (DC

coupled) 12.5X ±1.60 V5X ±1% over a dynamic range of –0.625 V to

+0.625 VLinearity

12.5X ±1% over a dynamic range of –1.60 V to+1.60 V

Differential –1.5 V to +2.5 VOffset voltage rangeSingle-ended andcommon-mode

–1.8 V to +3.4 V

Differential 0.093 ±2%, referred to inputOffset scale accuracy (referred toinput) Single-ended and

common-mode0.186 ±2%, referred to input

Differential –0.100 μV/ °C (5X)–0.60 μV/ °C (12.5X)

DC offset drift (referred to input)

Single-ended andcommon-mode

+0.100 μV/ °C (5X)+0.30 μV/ °C (12.5X)

5X ±(2% of input + 2% of offset + 15 mV +6.25 mV)

DC voltage measurement accuracy

12.5X ±(2% of input + 2% of offset + 37.5 mV +16 mV)

Maximum nondestructive input voltage ±15 V (DC + peak AC) between each input orbetween either probe inputs and ground

Input impedance (See page 29, Tip Specifications.)Differential input resistance, DC coupled 100 kΩ ±6 kΩInput resistance matching ±250 Ω side-to-side with respect to groundCommon-mode input resistance,DC coupled

50 kΩ ±3 kΩ


Specifications

Characteristic SpecificationDelay time 4.4 ns ±0.1 nsCommon-mode rejection ratio, differential-mode 2 >60 dB at DC

>40 dB to 50 MHz>30 dB to 1 GHz>20 dB to 10 GHz>12 dB to 20 GHz

Differential-mode rejection ratio, common-mode 2 >40 dB to 50 MHz>30 dB to 1 GHz>20 dB to 9 GHz>12 dB to 18 GHz

Channel isolation, single-ended mode 2 >40 dB to 50 MHz>30 dB to 1 GHz>15 dB to 9 GHz>6 dB to 18 GHz

Noise, probe only (all modes) <33 nV/ (5X)<48 nV/ (12.5X)

5X 20 GHz: 4.6 mVRMS23 GHz, 50 GS/s: 5.2 mVRMS25 GHz, 100 GS/s: 6.2 mVRMS

System noise 1

12.5X 20 GHz: 8.9 mVRMS23 GHz, 50 GS/s: 10.0 mVRMS25 GHz, 100 GS/s: 12.5 mVRMS

1 Measured using a ≥25 GHz oscilloscope @100 GS/s and a P75PST solder tip. The probe input mode is set to A-B (differential).2 Embedded probe only. Refer to Tip Specifications for specifications when using TriMode accessory tips. (See page 90, Tip Specifications.)


Specifications

Table 6: Typical mechanical characteristicsCharacteristic DescriptionDimensions, control box 125.4 mm × 41 mm × 35 mm (4.9 in × 1.6 in × 1.4 in)Dimensions, probe body 101.6 mm × 8.89 mm × 19 mm (4.0 in × 0.350 in × 0.750 in)Dimensions, cable length 1.0 m (39.3 in) (from the probe body to the control box)Unit weight 1.550 g (3.1 lbs) (probe, accessories and packaging)

Figure 19: Probe body and control box dimensions


Specifications

Nominal CharacteristicsNominal characteristics describe guaranteed traits, but the traits do not have tolerance limits.

Table 7: Nominal electrical characteristicsCharacteristic Description

P75PST solder tipP75TLRST solder tipTriMode Resistor & ExtendedResistor solder tips

Differential (two signal inputs, A and B; shared with single-ended)Single-ended (one each A and B signal input and two groundinputs)

Input configuration

P75PDPM handheld module Differential (two inputs, A and B)Output coupling DCProbe attenuationsettings

5X and 12.5X


Specifications

Tip SpecificationsThis section lists specifications that are applicable to the probe when used with the accessory tips available for the probe.All solder tips must be connected to the circuit with the shortest leads possible (typically <0.032 in./0.8 mm). Solder rampaccessories are included with the probe to help you minimize the lead lengths. The solder ramps position the probe tipconnections as close as possible to your circuit test points.


Specifications

P75PST Performance Solder TipSpecifications are typical and apply to all ranges and input modes unless specified otherwise. To achieve the highestperformance in differential (A–B) mode, the host instrument bandwidth must be ≥25 GHz with a sample rate of 100 GS/s.The soldered wires between the tip and your circuit must be kept as short as possible (typically <0.032 in./0.8 mm). Thebandwidth is less than 25 GHz for the other measurement modes (A, B, and common mode).

Bandwidth Rise time CMRR DMRR Channel isolation>25 GHz, A–Bmode, 100 GS/s≥23 GHz, A–Bmode, 50 GS/s>18 GHz,A, B, CM modes

10%–90%:<20 ps, A–B mode,100 GS/s<23.5 ps, A–B mode,50 GS/s<29 ps, A, B, CMmodes20%–80%:<15 ps, A–B mode<20 ps, A, B, CMmodes

>60 dB at DC>40 dB at 50 MHz>30 dB at 1 GHz>20 dB at 10 GHz>12 dB at 20 GHz

>40 dB at 50 MHz>30 dB at 1 GHz>20 dB at 9 GHz>15 dB at 18 GHz


Figure 20: P75PST Performance Solder Tip dimensions


Specifications

The following figure shows the typical step response of the probe with the P75PST solder tip. A 25 ps rise time pulse sourcewas used for this measurement.

Figure 21: TriMode probe with the P75PST solder tip


Specifications

The following figure shows a typical impedance plot of the probe with the P75PST solder tip.

Figure 22: P75PST differential impedance

P75TLRST TriMode Long Reach Solder Tip

Bandwidth Rise time CMRR DMRR Channel isolation>20 GHz, A–B mode>18 GHz, A, B, CMmodes

10%–90%:<27 ps, A–B mode<29 ps, A, B, CMmodes20%–80%:<18 ps, A–B mode<20 ps, A, B, CMmodes





Specifications

Figure 23: P75TLRST TriMode Long Reach Solder Tip dimensions


Specifications

The following figure shows the typical step response of the probe with the P75TLRST solder tip. A 50 ps rise time pulsesource was used for this measurement.

Figure 24: TriMode probe with the P75TLRST solder tip


Specifications

The following figure shows a typical impedance plot of the probe with the P75TLRST solder tip.

Figure 25: P75TLRST differential impedance


Specifications

TriMode Resistor Solder TipSpecifications are typical and apply to all ranges and input modes unless specified otherwise.

Bandwidth Rise time CMRR DMRR Channel isolation>18.0 GHz, A–Bmode>15.0 GHz, A, Bmodes>12.0 GHz, CMmode

10%–90%:<29 ps, A–B mode<32 ps, A, Bmodes<34 ps, CM mode20%–80%:<20 ps, A–B mode<22 ps, A, Bmodes<24 ps, CM mode




Figure 26: TriMode Resistor solder tip dimensions


Specifications

The following figure shows the typical step response of the probe with the TriMode resistor solder tip. A 50 ps rise timepulse source was used for this measurement.

Figure 27: Step response with the TriMode Resistor solder tip

The following figure shows a typical impedance plot of the probe with the TriMode resistor solder tip.

Figure 28: TriMode Resistor solder tip differential impedance


Specifications

TriMode Extended Resistor Solder TipSpecifications are typical and apply to all ranges and input modes unless specified otherwise.

Bandwidth Rise time CMRR DMRR Channel isolation>7 GHz, A–Bmode>4 GHz, A, Bmodes>2.5 GHz, CMmode

10%–90%:<32 ps, A–B mode<50 ps, A, Bmodes<120 ps, CMmode20%–80%:<24 ps, A–B mode<30 ps, A, Bmodes<40 ps, CM mode




Figure 29: TriMode Extended Resistor solder tip dimensions


Specifications

The following figure shows the typical step response of the probe with the TriMode extended resistor solder tip. A 50 psrise time pulse source was used for this measurement.

Figure 30: Step response with the TriMode Extended Resistor solder tip

The following figure shows a typical impedance plot of the probe with the TriMode extended resistor solder tip. The L=0value gives a simplified model that follows the lower impedance limit envelope.

Figure 31: TriMode Extended Resistor solder tip differential impedance


Specifications

P75PDPM Precision Differential Probing ModuleSpecifications are typical and apply to all ranges and input modes unless specified otherwise.

Bandwidth Rise time CMRR>18.0 GHz 10%–90%: <29 ps

20%–80%: <20 ps>60 dB at DC>40 dB at 50 MHz>30 dB at 1 GHz>20 dB at 10 GHz>15 dB at 20 GHz

Figure 32: P75PDPM Precision Probing Module dimensions


Specifications

The following figure shows the typical step response of the probe with the P75PDPM probing module. A 50 ps rise timepulse source was used for this measurement.

Figure 33: TriMode probe with the P75PDPM probing module


Specifications

The following figure shows the typical differential impedance of the probe with the P75PDPM probing module.

Figure 34: P75PDPM differential impedance


Service

ServiceThis section covers care, troubleshooting, and maintenance of your probe.

Host Instrument FirmwareSome instruments may require a firmware upgrade to support full functionality of the P7520A probe. Instruments with lowerversions of firmware may not display all probe controls and indicators on screen, and in some cases may require you topower-cycle the instrument to restore normal instrument operation.

The following table lists the required versions of instrument firmware for some of the instruments that currently supportthe P7520A probe.

Instrument Firmware VersionDPO/DSA70000D series oscilloscopes V 6.4.4 or higherDPO/DSA/MSO70000C series oscilloscopes with Windows7, 64-bit OS

V 6.4.0 or higher

DPO/DSA/MSO70000B, C series oscilloscopes withWindows XP, 32-bit OS

V 5.3.5 or higher

80A03 TekConnect Probe Adapter V 2.3 or higherRTPA2A TekConnect Probe Adapter V 2.3 or higher

To check the firmware version on Windows-based instruments, from the menu bar, click Help/About TekScope. OnLinux-based instruments, press the Utilities button on the front panel. If you need to upgrade your instrument firmware, go towww.tektronix.com/software to download the latest firmware.

Error ConditionsLED IndicatorsIf one of the Range or TriMode LEDs does not remain lit after you connect the probe, an internal probe diagnostic fault exists.Disconnect and reconnect the probe to restart the power-on diagnostic sequence. If the symptoms continue, the probe isdefective, and must be returned to Tektronix for repair.

Atten (Range) SettingIf you cannot change the attenuation by pressing the Atten. button on the probe, the host instrument may be in AutoRange mode. Change the range mode from Auto to Manual in the Probe Setup or Probe Controls screen. From theoscilloscope menu bar, select Vertical/Probe Cal or Vertical/Probe Setup and then select Manual in the TriMode ProbeRange or Attenuation section.

Signal DisplayIf the probe is connected to an active signal source and you do not see the signal displayed on the oscilloscope:

Check the probe tip connection on your circuit. (See page 17, Connecting to a Circuit Board.)

Check the probe tip connection at the probe body. (See page 5, Connecting Accessories to the Probe Body.)


Service

Perform a functional check using the TriMode calibration board included with the probe. (See page 9, Functional Check.)

Check that the bullet contacts are present and intact in the probe body. (See page 75, Inspecting the Bullets andConnectors.)

Input Mode/Probe Tip SelectionIf you cannot select an Input Mode other than A – B, and you are using a TriMode tip that does not provide a circuit groundconnection (such as the P75PDPM handheld module), this is normal operation. The other input modes refer to circuit groundand are only valid when a TriMode tip that provides a circuit ground connection is selected.

If you are using a TriMode tip that provides a circuit ground connection (such as the P75TLRST) and you cannot selectan Input Mode other than A – B, check the Probe Tip Selection screen on the oscilloscope. (See Figure 35 on page 71.)An incorrect probe tip might be selected. To access the Probe Tip Selection screen, select Vertical/Probe Cal from themenu bar, and then click Select in the Probe Tip section.

Figure 35: Probe Tip Selection screen


Service

Replaceable PartsThe following parts may need to be replaced due to normal wear and damage. When you replace these components, securethe probe in a small vise or positioner to simplify the procedure.

Table 8: TriMode probes replaceable partsDescription Replacement part numberProbe body bullet contacts 013-0359-xx, kit of 4P75TLRST and P75PST solder tip wires 020-2754-xx, Wire Replacement Kit, includes one bobbin each: 4 mil wire,

8 mil wire, and SAC305 solderTriMode Resistor (020-2936-xx) & TriModeExtended Resistor (020-2944-xx) solder tipresistors

020-2937-xx Replacement Resistor Kit, includes 50 each:100 Ω leaded resistors, 75 Ω surface mount resistors, nonconductive tubing

P75PDPM Probing Module springs 016-1998-xx, kit of 4 (large springs)016-1999-xx, kit of 4 (small springs)

P75PMT Probing Module tips (left and right) P75PMT, one pairP75TC Probing Module tip cable P75TC, qty. 1


Service

Table 9: Required equipmentDescription Minimum requirement Recommended example 1

Connector separator tool Custom tool 003-1897-xxGround spring tool Custom tool 003-1900-xxTweezers General purposeMagnifying glass or microscope Free standing to allow hands-free useProbe positioner or bench vise Able to hold probe PPM203B or PPM1001 Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers.


Service

Bullet ContactsThe input sockets in the probe bodyassembly are protected by replaceable bulletcontacts. (Replaceable bullets are includedin the accessory kit.)The bullet contacts protect the input socketsby absorbing the wear from repeatedconnect/disconnect cycles of the accessorytips.A bullet tool is shipped with the probe and isused to replace the bullet contacts from theprobe body assembly.

CAUTION. To prevent wear to the probe housing, use only the Bullet tool provided to remove and install the bullets fromthe probe body assembly. To prevent damage to the probe, before you connect accessories to the probe body, alwayscheck that the contacts are located in the probe body only.

Removing the BulletsFollow these steps to remove the bullets byusing the removal tool:

1. Squeeze the tool plunger to extend theholder tangs.

2. Insert the tool into the probe body sothat the holder tangs surround one of thebullets.

3. Release the plunger to secure the holdertangs on the bullet.

4. Gently pull the tool outward to removethe bullet.

5. Repeat for the other bullet.

NOTE. Discard the used bullets to preventaccidental reuse.


Service

Inspecting the Bullets andConnectorsUse a microscope to closely examine thebullets and connectors. Use the illustrationsto determine if the contacts appear worn orbroken, and always replace them in pairs.

1. Good

2. Chipped or bent ground contacts (outerconductor)

3. Chipped or bent signal contacts (innerconductor)

4. Inner contacts misaligned to outerconductor

Installing the Bullets1. Squeeze the tool plunger to extend the

holder tangs.

2. Insert a new bullet into the tool so thatthe holder tangs surround the bullet.

3. Release the plunger to secure the holdertangs on the bullet.

4. Insert the tool into the probe body andseat the bullet in the recess.

5. Squeeze the tool plunger to release thebullet.

6. Gently pull the tool out of the probe body.

7. Repeat for the other bullet.

8. Connect and remove a probe tip on theprobe body. Verify that the bullets areretained in the probe body.


Service

Solder Tip Wires and ResistorsThe solder vias on the circuit board at the end of the P75TLRST and P75PST Solder Tips are small (0.012 in.), and requiresmall wires to attach to your circuit. (Use the 4-mil and 8-mil wires included with the Wire Replacement kit to make theconnections.) Because of the small dimensions, the solder tips have a limited number of solder cycles that the vias canwithstand before the Solder Tips become unusable. If you expect to make frequent soldering changes, consider using theoptional TriMode Resistor solder tips. The resistors that extend off of these tips can accept a higher number of soldercycles and can be replaced when necessary.

NOTE. Axial-leaded tip resistors (included in the TriMode resistor replacement kit, Tektronix part number 020-2937-xx),should not be used in place of wires with the P75TLRST or P75PST probe tips unless the surface-mount, SMD0402 resistorsare also changed. The total probe tip resistance for the P7500 Series probes is designed to be 175 Ω.

CAUTION. To prevent damage to the circuit board or circuit board connections due to accidental movement of the probeand soldered leads, we recommend that you secure the tip to the circuit board using the adhesive tip tape provided in youraccessory kit. You can also use other materials such as Kapton tape or hot glue.

To avoid damage to the tip or the circuit under test, avoid applying excessive heat from the soldering iron. Use a low wattage,temperature-controlled soldering iron and appropriately sized soldering iron tip.

To prolong the life of your solder tips, consider the following points before you use the solder tips.

Consider the types of measurements that you plan to take. If you are going to take a few measurements at one locationand then move to another, you may be able to use longer wires. Longer wires may degrade your measurement slightly(which may not matter), but the wires can then be cut or desoldered at your circuit and reused, rather than subjecting thesolder tip to a desolder/solder cycle.

Perhaps the optional P75PDPM Precision Differential Probing Module is a better choice for the test points that you do notmeasure as often. The probing module can take both single-ended and differential measurements, and when used with aprobe positioner, can provide hands-free access to tight spaces. Depending on your measurement requirements and circuitgeometries, the probing module might be a preferable alternative.

At critical test points such as circuit outputs, you might need to keep the wires as short as possible. If possible, use the soldertip dimensions shown in the Specifications section to lay out a matching footprint on your circuit board.

Use the following precautions when you solder the tips:

For best soldering results, use a microscope to examine the quality of the solder joints.

Use a low-wattage, temperature-controlled soldering iron and a small mass soldering iron tip. The soldering irontemperature should be set as low as possible, while still providing a reliable solder joint.

Use SAC305 solder (included with the wire replacement kit) to attach the tip wires to the circuit under test.

When replacing tip wires or axial-lead resistors, solder wick can be used to remove the excess solder from the probe tipcircuit board via holes. Be careful not to overheat the via and damage the board.

The attachment wires should be bent symmetrically to vary the interconnect spacing. Use care when you solder a tip to acircuit under test to avoid inadvertently desoldering either the attachment wires or the damping resistor.

For optimum performance and signal integrity, keep the lead length between the DUT (Device Under Test) and the tip asshort as possible, and the lead lengths the same length.


Service

Replacing the TriMode Solder TipResistorsThe resistors that are presoldered to thetips can break off during normal use. A kitof replacement resistors is available. (Seepage 30, Optional Accessories.) To replacethe resistors, do the following:

1. Carefully apply a soldering iron to the viaon the tip board and remove the resistorlead. Work quickly with a low-heatsoldering iron.If a small piece of wire is in the via, heatthe solder and use another piece of wireto push the wire fragment from the via.

2. Add fresh solder to the via, if necessary.

3. Cut one lead of the replacement resistorto approximately 0.6” (15 mm) for thelong tip, or 0.2” (5 mm) for the short tip.

4. If you are replacing the resistor on theextended resistor tip, slide a piece oftubing included with the resistor kit overthe lead. This will insulate the resistorlead.

5. Heat the solder in the via and insert theresistor lead into the via until the:insulating tube comes into contact withthe tip board, if you are replacing theresistor on the extended resistor tip.resistor body almost touches the tipboard, if you are replacing the resistoron the (short) resistor tip.

6. Cut the excess lead on the bottom of theboard.

7. Cut the remaining resistor lead to 0.1”(2.5 mm).


Service

P75PDPM Probing Module SpringsEquipment Required:

ground spring tool

tweezers

probe holder

magnifying glass or microscope

Large and small springs shown installed

Remove the Spring

1. Adjust the tip gap using the gapmeasurement tab on the spring tool. Setthe tool between the tip circuit boards,not the tips.


Service

2. Insert the ground spring tool under thetop of the spring.


Service

3. Rock the tool away from the tips so thatthe spring clears the seat edge.

4. Gently pull the tool away; the springshould come away with the tool.

5. Put the spring in the accessory containeror a safe place to avoid losing the spring.

Install. Two spring sizes are available:the small spring allows 0.030 – 0.090 in.(0.76 – 2.28 mm) tip span, the large springallows 0.050 – 0.180 in. (1.27 – 4.57 mm)tip span.

1. Check that the tip gap is .032 in. usingthe gap measurement tab on the springtool. Adjust if necessary.


Service

2. Using tweezers, install the spring on thetool. The tool has a large and small side,one for each size spring. Make sure thegap in the spring is on the top of the toolas shown.

3. Set the bottom of the spring in the frontseats (those closest to the tip ends).Maintain a slight pressure on the springto keep it in the front seats.


Service

4. Set the top of the spring in the rear seatsby lifting the tool to clear the edge of therear seat with the top of the spring.

5. Gently retract the tool from the spring.Verify that the spring is seated as shown.


Service

P75TC Probing Module Tip CableEquipment Required: connector separatortool

1. Disconnect the Cable Tip by the insertingthe tool between the connectors.The tapered edges of the tool gentlyseparate the cable connector from thetip connector.

2. Repeat for the other cable and thenpull both cables away from the tipconnectors.


Service

P75PMT Probing Module Tips (Leftand Right)Equipment Required:

connector separator tool

tweezers

probe holder

magnifying glass or microscope(preferred)

NOTE. The probing module tips areelectrically matched pairs and should bereplaced together. Failure to do so maydegrade the performance of your probe.

Remove.

1. Disconnect the Cable Tips.

2. Remove the spring.

3. Adjust the tip gap to maximum width.

4. Use the connector separator tool or asmall screwdriver to pry the board upfrom the bottom. The bottom tabs aredesigned to flex; the top tabs are not.

5. Repeat for the other tip.

Install.

6. Separate the new tip board pair bysnapping the board against a sharpedge.


Service

7. Select the correct board (left or right),and seat the board in the top tabs. Theboard is notched to align it to the tip body.

8. Press the bottom of the board to snap itpast the bottom tabs.

9. Repeat the previous two steps for theother tip.

10. Attach the spring.

11. Reattach the cable pair.


Service

Handling the ProbeThis probe is a precision high-frequency device; exercise care when you use and store the probe. The probe and cableare susceptible to damage caused by careless use. Always handle the probe at the control box and probe body to avoidundue physical strain to the probe cable, such as kinking, excessive bending, or pulling. Visible dents in the cable willincrease signal aberrations.

CAUTION. To prevent damage to the probe, always use an antistatic wrist strap connected to a static-controlled workstationwhen you handle the probe. The probe input contains electronic components that can be damaged by contact with highvoltages, including static discharge.

Observe the following precautions when using the probe. Do not do any of the following:

Drop the probe or subject it to physical shock

Subject the probe to adverse weather conditions

Kink or fold the probe cable tighter than a 2 inch radius

Solder the tips with excessive heat or duration

Injure yourself with the sharp tips


Service

Cleaning the Probe

CAUTION. To prevent damage to the probe, do not expose it to sprays, liquids, or solvents. Avoid getting moisture insidethe probe during exterior cleaning.

Do not use chemical cleaning agents; they may damage the probe. Avoid using chemicals that contain benzine, benzene,toluene, xylene, acetone, or similar solvents.

Clean the exterior surfaces of the probe with a dry, lint-free cloth or a soft-bristle brush. If dirt remains, use a soft cloth or swabdampened with a 75% isopropyl alcohol solution and rinse with deionized water. A swab is useful to clean narrow spaces onthe probe; use only enough solution to dampen the swab or cloth. Do not use abrasive compounds on any part of the probe.


Service

Returning the Probe for ServicingIf your probe requires servicing, you must return it to Tektronix. If the original packaging is unfit for use or not available, usethe following packaging guidelines:

Preparation for Shipment

1. Use a corrugated cardboard shippingcarton having inside dimensions atleast one inch greater than the probedimensions. The box should have acarton test strength of at least 200pounds.

2. Put the probe into an antistatic bag orwrap it to protect it from dampness.

3. Place the probe into the box and stabilizeit with light packing material.

4. Seal the carton with shipping tape.

5. Refer to Contacting Tektronix at thebeginning of this manual for the shippingaddress.


Index

Index

AAccessories

optional, 30standard, 27

Adjustments, 25

BBullet Contacts, 74

inspecting, 75installing, 75removing, 74

CCalibration

checking the instrumentstatus, 13

probe, 12running on the instrument, 15TriMode, 12

Cleaning the probe, 87Compensate probe, 15Connecting

tip cables to the probe body, 5to your circuit, 8

Connecting to circuit withhandheld module, 24solder tip, 17

Connecting to instrumentswith a TekConnect interface, 3without a TekConnect

interface, 26Controls and indicators

Atten button and LEDs, 6Input Mode button and LEDs, 7power-on sequence, 4TriMode, 7

DDifferential-mode signal range, 38Documentation, vi

CD, 27

EEmbedded Probe, 50

Error conditionsInput Mode, 71Range & TriMode LEDs, 70signal display, 70

FFirmware, 70Functional check, 9

HHandling the probe, 86Host instrument firmware, 70

IInput

impedance, 49tips, 17, 18voltage limits, 37

Input Mode, 7, 36, 71selection, 71

Installation, 3

MMaximizing signal bandwidth, 16Maximizing signal fidelity, 42Menu

Probe Controls, 6probe setup, 15, 41Probe Setup, 6probe tip selection, 71

OOffset voltage range, 38Operating

considerations, 2voltage window, 38

Optional accessories, 30Options, 34

PProbe

calibrating, 13cleaning, 87compensating, 15Controls screen, 6embedded, 50handling, 86loading, 49power-on, 4Setup screen, 6tip selection, 71

Probe controlsAtten button and LEDs, 6, 35Input Mode button and LEDs, 7,

36TriMode measurements, 7

Probing Module, 31, 46

RRelated documentation, viReplaceable parts

solder tip resistors, 77Returning the probe, 88

SSafety Summary, iiiScreen

Probe Controls, 6probe setup, 15, 41Probe Setup, 6probe tip selection, 71

Solder Tipconnecting, 19ramp, 20, 45

Solder Tip Resistors, 31Specifications, 51

mechanical, 54nominal, 55probing module, 67tips, 56typical, 52warranted, 51

Standard accessories, 27


Index

TTriMode operation, 40TriMode Solder Tip

Extended Resistor, 17, 30replacing resistors, 77Resistor, 17, 30


P7520A TriMode™ Probe - Tektronixdownload.tek.com/manual/P7520A-Probe-Instruction-Manual.pdf ·...

Documents

Transcript of P7520A TriMode™ Probe - Tektronixdownload.tek.com/manual/P7520A-Probe-Instruction-Manual.pdf ·...